.\"	$OpenBSD: CRYPTO_lock.3,v 1.3 2024/03/14 22:09:40 tb Exp $
.\"	OpenSSL doc/crypto/threads.pod fb552ac6 Sep 30 23:43:01 2009 +0000
.\"
.\" Copyright (c) 2019 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: March 14 2024 $
.Dt CRYPTO_LOCK 3
.Os
.Sh NAME
.Nm CRYPTO_lock ,
.Nm CRYPTO_w_lock ,
.Nm CRYPTO_w_unlock ,
.Nm CRYPTO_r_lock ,
.Nm CRYPTO_r_unlock ,
.Nm CRYPTO_add
.Nd thread support
.Sh SYNOPSIS
.In openssl/crypto.h
.Ft void
.Fo CRYPTO_lock
.Fa "int mode"
.Fa "int type"
.Fa "const char *file"
.Fa "int line"
.Fc
.Ft int
.Fo CRYPTO_add
.Fa "int *p"
.Fa "int amount"
.Fa "int type"
.Fc
.Bd -literal
#define	CRYPTO_w_lock(type) \e
	CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE, type, __FILE__, __LINE__)
#define	CRYPTO_w_unlock(type) \e
	CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE, type, __FILE__, __LINE__)
#define	CRYPTO_r_lock(type) \e
	CRYPTO_lock(CRYPTO_LOCK|CRYPTO_READ, type, __FILE__, __LINE__)
#define	CRYPTO_r_unlock(type) \e
	CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_READ, type, __FILE__, __LINE__)
.Ed
.Sh DESCRIPTION
These functions are obsolete.
.Pp
.Fn CRYPTO_lock
locks or unlocks a mutex lock.
.Pp
.Fa mode
is a bitfield describing what should be done with the lock.
For each call, either
.Dv CRYPTO_LOCK
or
.Dv CRYPTO_UNLOCK
must be included.
In the LibreSSL implementation,
.Dv CRYPTO_READ
and
.Dv CRYPTO_WRITE
are ignored.
.Pp
.Fa type
is a number in the range 0 <=
.Fa type No < Dv CRYPTO_NUM_LOCKS
identifying a particular lock.
Currently, the value of
.Dv CRYPTO_NUM_LOCKS
is 41.
.Pp
The
.Ar file
and
.Ar line
arguments are ignored.
.Pp
In the LibreSSL implementation,
.Fn CRYPTO_lock
is a wrapper around
.Xr pthread_mutex_lock 3
and
.Xr pthread_mutex_unlock 3 .
.Pp
.Fn CRYPTO_add
locks the lock number
.Fa type ,
adds
.Fa amount
to
.Pf * Fa p ,
and unlocks the lock number
.Fa type
again.
.Sh RETURN VALUES
.Fn CRYPTO_add
returns the new value of
.Pf * Fa p .
.Sh SEE ALSO
.Xr crypto 3
.Sh HISTORY
.Fn CRYPTO_lock ,
.Fn CRYPTO_w_lock ,
.Fn CRYPTO_w_unlock ,
.Fn CRYPTO_r_lock ,
and
.Fn CRYPTO_r_unlock
first appeared in SSLeay 0.6.0.
.Fn CRYPTO_add
first appeared in SSLeay 0.6.2.
These functions have been available since
.Ox 2.4 .
